The Seasonic X series is the Taiwanese OEM power supply establishments first commercial retail series to achieve 80PLUS Gold certification. This means that the unit is 87% efficient at 20%, 50%, and 100% load. It supports multiple video cards, and uses a patented system which supplies at a lower amperage the same power using a voltage regulation module. ThinkComputers has the review of the 650W version, a medium-wattage, modular unit.